2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/24303We investigate charge ordering in a quarter-filled ladder at finite temperature by determinantal Quantum Monte Carlo. The sign problem is moderate in a wide range of model parameters relevant for NaV2O5. The charge order parameter exhibits a crossover as a function of inverse temperature on finite systems. Above a critical nearest neighbor Coulomb repulsion, the correlation length grows exponentially with inverse temperature, indicative of the ordered phase at T=0. We find a clear single-particle gap manifesting itself in a flat n(μ) dependence at large nearest neighbor Coulomb repulsion.2 pages, 4 eps-figures, submitted to SCES04Strongly Correlated Electronstext